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VGA conversion question

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by what the ...!

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I have a HP Vector Signal Analyzer (VSA) and higher ups would like to port it's display to other places. It claims to have a "standard" VGA output and it can indeed be displayed on a (ancient) NEC multisync 3 monitor, but not on any newer multisynctype monitors. The claimed Spec.s are: analog plug-compatible with 25.5 kHz multi-sync monitors, 75 Ohm, 0-0.7 V, display rate 60 Hz, Horz. refresh rate 25.5 kHz, Horz. lines 400.The obvious was to port this to a commercial "VGA to video" converter, and plumb that into a modulator and pipe the RF around to the desired sites, but after trying ALL of the available (I purchased three different ones) models that I could find on the market I determined that the "standard" video is a standard that HP decided on without consulting the rest of the industry. Any ideas on how to convert this "standard" VGA into a useful output?

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by jdkline

"Standard" VGA output? That's an oxymoron if I ever heard one. There are
so many different VGA signals it's a wonder a monitor can be multisync.
Most VGA signals I've seen specs on are 70Hz with the old stuff 60Hz.
That may be why only the old monitor will work with the signal analyzer.

Your best bet is to find a converter from the same era and vintage as the Signal Analyzer. I know a guy who might have such a converter. It reguires 640x480 resolution, can the analyzer? My e-mail address is JKComputer@juno.com.

Hope this information helps.
JDKline

by richard_barsby

VGA as the original standard specified started at 31.5kHz @ 60 Hz for 640x480 for a monitor to lock at 25kHz you will require a multisync in the range 15kHz to 31.5kHz. 25 kHz was used by Sega and others as an extended EGA standard which differs from the standard EGA of 21.8kHz.

R.K.Barsby

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